The undeclared halt in CIA attacks in Pakistan, now in its sixth week, aims at reversing a sharp erosion in trust after deadly incidents, including the mistaken attack on soldiers by U.S. gunships.

In an effort to mend badly frayed relations with Pakistan, the CIA has suspended drone missile strikes on gatherings of low-ranking militants believed to be involved in cross-border attacks on U.S. troops or facilities in Afghanistan, current and former U.S. officials say.

The undeclared halt in CIA attacks, now in its sixth week, is aimed at reversing a sharp erosion of trust after a series of deadly incidents, including the mistaken attack by U.S. gunships that killed 24 Pakistani soldiers last month.

The pause also comes amid an intensifying debate in the Obama administration over the future of the CIA's covert drone war in Pakistan. The agency has killed dozens of Al Qaeda operatives and hundreds of low-ranking fighters there since the first Predator strike in 2004, but the program has infuriated many Pakistanis.

Some officials in the State Department and the National Security Council say many of the airstrikes are counterproductive. They argue that rank-and-file militants are easy to replace, and that Pakistani claims of civilian casualties, which the U.S. disputes, have destabilized the government of President Asif Ali Zardari, a U.S. ally.

And some U.S. intelligence officials are urging the CIA to cut back the paramilitary role it has assumed since the terrorist attacks of Sept. 11, 2001, to refocus on espionage. They suggest handing the mission to the Pentagon's Joint Special Operations Command, which flies its own drones and conducts secret counter-terrorism operations in Yemen and Somalia.

The policy remains intact for now. But the CIA has decided to temporarily suspend so-called signature strikes, missile attacks against fighters and others whose actions, after observation by surveillance drones or other intelligence, suggest support for the Taliban and other insurgent groups in neighboring Afghanistan.

Among those targeted this year were members of the Haqqani network, an insurgent group allied with the Taliban. U.S. officials say Haqqani fighters took part in September attacks on the U.S. Embassy and NATO headquarters in Kabul, the Afghan capital.

The number of drone strikes in Pakistan has increased dramatically during the Obama administration. Under President George W. Bush, most of them targeted known Al Qaeda and Taliban leaders. In July 2008, Bush gave the CIA additional authority to kill militants whose names were not known, but whose "pattern of life," as the CIA called it, suggested involvement with terrorists or insurgent groups.

Under President Obama, the CIA has expanded the drone war to target anyone in Pakistan's tribal areas it considers a potential threat. The CIA has authority to fire at will, without authorization from outside the agency, as long as targets are in approved geographic "boxes" near the Afghan border.

Saying the strikes violate national sovereignty, Pakistan's government wants a say in drone targeting and a degree of control over the CIA missions, a senior Pakistani defense official said in Washington. But the Obama administration has refused, citing cases in which targets escaped after intelligence was shared with Pakistan.

One of the main points of friction between the two countries was the U.S. raid in May that killed Osama bin Laden. U.S. officials launched the attack without telling Pakistan for fear of tipping off the Al Qaeda leader.

U.S. and Pakistani officials said the CIA is still flying armed Predator and Reaper drones over Pakistan, and will kill an Al Qaeda leader if the aircraft find one. But thanks in part to the drone war, only a few senior members of the core Al Qaeda group are believed to be still alive there, including Bin Laden's successor, Ayman Zawahiri.

The CIA keeps a list of 20 top targets and "there have been times where they've struggled a little bit coming up with names to fill that list," said a former senior U.S. intelligence official, who declined to be identified in discussing a classified program.

The former official is among those urging the CIA to reconsider its approach, arguing that the agency can't kill all the fighters and that drones alone won't solve the challenge from Islamic militants.

"A lot of people wonder whether we can keep trying to kill our way out of this problem," the former official said. "There are people who are really questioning, 'Where does all of this end?'"

When the current CIA director, David H. Petraeus, served as commander of U.S. troops in Afghanistan, he was known to be concerned that the CIA conducted drone strikes without sufficient regard for the military or diplomatic repercussions in either Afghanistan or Pakistan.

Some State Department officials insist that airstrikes on low-level militants now hurt U.S. interests in Pakistan more than they help.